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Optical disc apparatus and its control method

A technology for optical discs and equipment, which is applied in the field of optical disc equipment and its control, and can solve problems such as low reflectivity, complex and difficult circuit arrangements, etc.

Inactive Publication Date: 2005-07-13
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practice, the two signals must be detected at the same time, and in order to achieve this, the circuit arrangement of the circuit becomes extremely complex
[0006] It is difficult to detect the amount of tilt and perform satisfactory tilt control (tilt compensation) for a disc size for high-density information recording (for example, large-capacity recording compatible with a 12cm disc using a blue laser)
This problem is not limited to single-sided / single-layer discs, but is more severe in double-sided / multi-layer discs with lower reflectivity

Method used

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  • Optical disc apparatus and its control method
  • Optical disc apparatus and its control method
  • Optical disc apparatus and its control method

Examples

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Embodiment Construction

[0050] 1 is a block diagram of an optical disc apparatus (information recording / reproducing system) according to an embodiment of the present invention, for explaining the circuit arrangement of an optical disc. Fig. 1 shows a general diagram of a system for recording or reproducing information using an optical disc having one or more information recording layers on one surface.

[0051] 1 shows an optical disc apparatus for recording or reproducing information on or from an optical disc whose information recording layer has spiral or concentric tracks. This optical disc device comprises: optical head (10), and it focuses laser beam on the information recording layer of optical disc 1 by objective lens 5, and record / reproduce information on optical disc; Focus controller (22), it makes objective lens 5 offset, In order to focus the beam spot of the laser beam on the information recording layer of the optical disc 1; the positioning unit (12), which positions the optical head 1...

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Abstract

Before the tracking control, the phase difference tracking error signal is tilted control, the phase difference tracking error signal, for example, the output of the 4-quadrant photodetector signal processing obtained. The center value of the tracking error signal based on the phase difference is an indication of "positive or negative bias", determining the tilt direction of the tilt control that needs to be corrected. Therefore, when the polarity information of the bias is used to observe the amplitude of the phase difference tracking error signal, the tilt servo can be aimed at the optimal point.

Description

technical field [0001] The present invention relates to an optical disc device and its control method for recording or reproducing high-density information represented by, for example, high-capacity image video data (Hi-vision video data). More particularly, the present invention relates to improved tilt control in accordance with the tilt state of an optical disc mounted on a device. Furthermore, the present invention also relates to a method of detecting a tilt error in tilt control. Background technique [0002] In recent years, with the increase in the recording density of optical discs using short-wavelength lasers, it is required to properly adjust the inclination of the optical head (and its objective lens) relative to the recording surface of the disc loaded in the disc drive over the entire surface from the inner circumference to the outer circumference of the disc. compensation. As a tilt compensation means, tilt control (tilt compensation) is well known. High-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/085G11B7/00G11B7/09G11B7/095
CPCG11B7/0906G11B7/094G11B7/0956A47G27/0243
Inventor 米泽实
Owner KK TOSHIBA